Added new boolean property to track whether a bill should be paid by the tenant.
Changes:
- Added billedToTenant property to Bill interface in db-types.ts
- Added checkbox UI control in BillEditForm for billedToTenant
- Added state management and change handler for the checkbox
- Added i18n translations (EN: "Billed to tenant", HR: "Plaća podstanar")
- Set default value to true for new bills
Note: Server action implementation pending - property not yet persisted to database.
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Co-Authored-By: Claude <noreply@anthropic.com>